High aphid numbers are being found in fields in counties bordering Lake Simcoe (Simcoe, Durham and Victoria). Spraying has been necessary in many of the fields that have been scouted. Scouting is advised in all fields in that region, starting first with the fields that were not treated with Cruiser. Cruiser treated fields should not be reaching threshold yet but could be starting to have aphids colonize in them. Past 35-40 days after planting the insecticide is no longer toxic to the aphid, but these fields have most likely not had enough time to build up to threshold levels yet. So if time is limited, scout non-Cruiser fields first, then return to the Cruiser fields to scout on a weekly basis to stay ahead of any situations.
